romney will also join his running mate paul ryan at a rally in lancaster, ohio. president obama does not have a rally planned today, however tonight he'll host a dinner for winners of a contest. >>> for 90 minutes last night, joe biden and paul ryan went back and forth on a variety of issues, including the economy, the crisis in syria, health care, and abortion. on tax reform, ryan said there aren't enough rich americans to pay for all the president's spending. vice president joe biden said the only way to pay for romney's plan is to raise middle class taxes. the two also sparred on iran. >> we will not allow the iranians to get a nuclear weapon. >> they're moving faster towards a nuclear weapon. it's because the administration has no credibility on this issue. >> there is no weapon the iranians have at this point. you going to go to war? is that what you want to do now? >> we want to prevent war. >> ryan said he agreed with the president to pull troops out of the country by 2014 but said the white house should not announce a deadline and expose potential weaknes